Thank you, Gerardo, and yes I know that different devices can have same MCU from my own experience.

So I think one sample of each device will be sufficient.

Maybe we can save a lot of work when we tell IN ADVANCE which device we will going to open to get the informations you need...

I can provide you with information on the following devices within next days:
Schachakademie = TCA
Mystery
Centurion
Chess Challenger (should be identical to Centurion, is not in your list above)
Virtuoso

So no one else need to open these devices.

Cheers,
Andreas